btrfs receive to subdirectory

[Rory Campbell-Lange <rory@xxxxxxxxxxxxxxxxxx>]

I can send snapshots to <volume>, but not <volume>/<dir>. Please advise
if what I am doing is incorrect.

Rory

Format usb3 disk and mount
	root@orchard:/bkp# mkfs.btrfs /dev/sdb1
	> WARNING! - Btrfs v0.20-rc1-37-g91d9eec IS EXPERIMENTAL
	> WARNING! - see http://btrfs.wiki.kernel.org before using
	> fs created label (null) on /dev/sdb1
	> 	nodesize 4096 leafsize 4096 sectorsize 4096 size 698.64GB
	> Btrfs v0.20-rc1-37-g91d9eec
	mount /dev/sdb1 /mnt


Create snapshots on /bkp share
	root@orchard:/bkp# btrfs subvolume snapshot -r subvol snaps/snap_081012_1715
	> Create a readonly snapshot of 'subvol' in 'snaps/snap_081012_1715'
	root@orchard:/bkp# mutt -f subvol/INBOX/
    > 1561 kept, 18 deleted.
	root@orchard:/bkp# btrfs subvolume snapshot -r subvol snaps/snap_081012_1716
    > Create a readonly snapshot of 'subvol' in 'snaps/snap_081012_1716'

Send base backup to /mnt
	root@orchard:/bkp# btrfs send snaps/snap_081012_1715 | btrfs receive /mnt
	> At subvol snaps/snap_081012_1715
	> At subvol snap_081012_1715

Send incremental backup to /mnt
	root@orchard:/bkp# btrfs send -p snaps/snap_081012_1715 \
                       snaps/snap_081012_1716 | btrfs receive /mnt
	> At subvol snaps/snap_081012_1716
	> At snapshot snap_081012_1716

	root@orchard:/bkp# ls /mnt
	snap_081012_1715  snap_081012_1716

Results:
	root@orchard:/bkp# btrfs subvolume list /bkp 
	> ID 259 gen 62 top level 5 path subvol
	> ID 278 gen 60 top level 5 path snaps/snap_081012_1715
	> ID 279 gen 62 top level 5 path snaps/snap_081012_1716
	root@orchard:/bkp# btrfs subvolume list /mnt 
	> ID 256 gen 8 top level 5 path snap_081012_1715
	> ID 259 gen 9 top level 5 path snap_081012_1716

Restart:
	root@orchard:/bkp# btrfs subvolume del /mnt/snap_081012_171*
	> Delete subvolume '/mnt/snap_081012_1715'
	> Delete subvolume '/mnt/snap_081012_1716'

Try and snap to /mnt/<subdir>
	root@orchard:/bkp# mkdir /mnt/snaps
	root@orchard:/bkp# btrfs send snaps/snap_081012_1715 | btrfs receive /mnt/snaps
	> At subvol snaps/snap_081012_1715
	> At subvol snap_081012_1715
	root@orchard:/bkp# btrfs send -p snaps/snap_081012_1715 \
	                   snaps/snap_081012_1716 | btrfs receive /mnt/snaps
	> At subvol snaps/snap_081012_1716
	> At snapshot snap_081012_1716
	> ERROR: open snaps/snap_081012_1715 failed. No such file or directory
    root@orchard:/bkp# ls /mnt/snaps
    > snap_081012_1715



-- 
Rory Campbell-Lange
rory@xxxxxxxxxxxxxxxxxx
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